Speed and position sensing device for emd two-cycle diesel engines

ABSTRACT

A device is disclosed for sensing the speed of an EMD 567/645/710 two-cycle diesel engine having a crankcase, electronic fuel injectors and an electronic control system for controlling the electronic fuel injectors. The device includes a spline shaft sized for insertion into the crankcase of the engine so that the spline shaft rotates with the engine, a gear operably secured to the spline shaft to rotate with the spline shaft and sized to rotate with the engine in a 1:1 ratio, and at least one electronic sensor located adjacent the gear to sense rotation of the gear. The at least one electronic sensor is connectable to the electronic control system to provide electronic signals to the electronic control system for determining when to inject fuel with the electronic fuel injectors. Also disclosed is a method for retrofitting the engine and a kit for retrofitting the engine.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.12/622,815 filed on Nov. 20, 2009 which is a continuation-in-part ofU.S. patent application Ser. No. 12/496,219 filed on Jul. 1, 2009, thedisclosures of which are expressly incorporated herein in theirentireties by reference.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH

Not Applicable

REFERENCE TO APPENDIX

Not Applicable

FIELD OF THE INVENTION

The field of the present invention generally relates to two-cycle dieselengines produced by the Electro-Motive Division (EMD) of General MotorsCorporation and, more particularly, to monitoring the engine speed andposition for such engines.

BACKGROUND OF THE INVENTION

As part of the U.S. Environmental Protection Agency's (US EPA) ongoingNational Clean Diesel Campaign, the EPA has adopted new standards thatdramatically reduce emissions of nitrogen oxide (NO_(x)), dieselparticulate matter (PM), unburned hydrocarbon (HC), and carbon monoxide(CO) from locomotive and marine diesel engines. Engines produced from2005 to 2010 must meet US EPA Tier 2 standards, while engines producedfrom 2011 to 2014 must meet US EPA Tier 3 standards and engines producedfrom 2015 and beyond must meet US EPA Tier 4 standards. It is noted thatengines produced prior to 1973 were uncontrolled while engines producedfrom 1973 to 2001 were required to meet US EPA Tier 0 standards andengines produced from 2002 to 2004 were required to meet US EPA Tier 1standards.

While these EPA standards primarily relate to new and remanufacturedengines, there is increasing pressure to reduce emissions of allexisting non-road diesel engines. Eventually, all existing locomotiveengines produced prior to 1973 must meet the US EPA Tier 0 standards andpotentially even lower emission levels. For locomotives operating inspecific emissions-regulated locations including California and Texas,emission levels must be reduced further with agreements to encourage theuse of engines that meet the US EPA Tier 2 standards.

EMD produced more than 70,000 engines and has the largest installed baseof diesel-electric locomotives in both North America andinternationally. Among the two-cycle diesel engines produced by EMD arethe EMD 567 series which was produced from 1938 until 1966 and the EMD645 series which was produced from 1965 until 1988. The EMD 710 serieswhich was produced from 1985 and is still produced currently. The EMD567/645/710 engines can be used for long periods of time due to theirability to be repeatedly repaired/overhauled and the high cost of newlypurchased engines.

There is a large population of EMD 567/645/710 engines in service thathave not reached the end of their useful life—a unique feature of thisengine segment compared to smaller engine models. Some existing enginesmay exceed fifty years of age. Because of the emission standards,however, the owners of these EMD 567/645/710 engines are faced with theoption of either overhauling or rebuilding the engines to meet the neweremission standards or retiring the engines early and purchasing newtechnology engines that meet the current emission standards. As aresult, the owners of these engines stand to incur a heavy financialloss. Accordingly, there is a need for a cost effective system andmethod for extending the useful life of these two-cycle diesel engineswithout requiring an expensive overhaul or new replacement engine.

One method for reducing the emissions on these engines involves theinstallation of electronic fuel injection. The current system utilizesmechanical injection where the injection is determined based on machineddimensions that are fixed, and do not vary during the use of theproduct. Electronic injection allows flexibility by varying theinjection based on numerous inputs. Some of these inputs may includeambient temperature, altitude, geographic location, and so forth. Sincethe injectors are no longer fixed mechanically they require input fromthe engine as to the speed and position of the drive-train to determinewith accuracy the time to begin, hold, and end, injection. New engineswith electronic fuel injection incorporated in to the design utilize theflywheel for the monitoring and measurement of speed and RPM. Theutilization of a once per revolution sensor to sense the absoluteposition, and then the monitoring of the flywheel teeth forsynchronizing the position during the revolution is done utilizing twosensors on the flywheel. The concern with this prior art is that thesensors have a history of being damaged and moved due to their locationin an area of the engine that is frequently accessed by mechanics.Accordingly, there is a need for an accurate device for monitoring andmeasuring the speed and position of these two-cycle diesel engines thatcan be easily installed in a retrofit or new application and in aposition for reliable operation.

SUMMARY OF THE INVENTION

The present invention provides a method and device which overcomes atleast some of the above-noted problems of the related art. Disclosed isa device for sensing the speed of an EMD 567/645/710 two-cycle dieselengine having a crankcase, electronic fuel injectors and an electroniccontrol system for controlling the electronic fuel injectors. The deviceincludes a shaft sized for connection to the crankshaft of the engine sothat the shaft rotates with the engine, a gear operably secured to theshaft to rotate with the shaft and sized to rotate with the engine in a1:1 ratio, and at least one electronic sensor located adjacent the gearto sense rotation of the gear. The at least one electronic sensor isconnectable to the electronic control system to provide electronicsignals to the electronic control system for determining when to injectfuel with the electronic fuel injectors.

Also disclosed is a kit for reducing exhaust emissions from an existingEMD 567/645/710 two-cycle diesel engine by retrofitting the engine frommechanical fuel injection to electronic fuel injection. The kit includesa plurality of electronic unit fuel injectors, an electronic controlmodule to be electrically connected to the electronic unit fuelinjectors for delivering injection signals to the electronic unit fuelinjectors, and a device for sensing speed of the engine. The deviceincludes a shaft sized for connection to a crankshaft of the engine sothat the shaft rotates with the engine, a gear operably secured to theshaft to rotate with the shaft and sized to rotate with the engine in a1:1 ratio, and at least one electronic sensor located adjacent the gearto sense rotation of the gear. The at least one electronic sensor isconnectable to the electronic control module to provide electronicsignals to the electronic control module for determining when to injectfuel with the electronic unit fuel injectors.

Also disclosed is a method for retrofitting an EMD 567/645/710 two-cyclediesel engine to reduce exhaust emissions. The method includes the stepsof removing a governor angle drive housing from the engine and securinga device for sensing speed of the engine at a governor angle drivelocation of the engine. The device for sensing speed of the engineincludes a shaft sized for connection to a crankshaft of the engine atthe governor angle drive location of the engine so that the shaftrotates with the engine, a gear operably secured to the shaft to rotatewith the shaft and sized to rotate with the engine in a 1:1 ratio, andat least one electronic sensor located adjacent the gear to senserotation of the gear.

From the foregoing disclosure and the following more detaileddescription of various preferred embodiments it will be apparent tothose skilled in the art that the present invention provides asignificant advance in the technology and art of two-cycle dieselengines. Particularly significant in this regard is the potential theinvention affords for providing a cost effective, reliable, and accuratedevice for monitoring and measuring the speed and/or position oftwo-cycle diesel engines without requiring an expensive overhaul or newreplacement engine. Additional features and advantages of variouspreferred embodiments will be better understood in view of the detaileddescription provided below.

BRIEF DESCRIPTION OF THE DRAWINGS

These and further features of the present invention will be apparentwith reference to the following description and drawings, wherein:

FIG. 1 is a diagrammatic view of a two-cycle diesel engine having amechanical fuel injection system;

FIG. 1B is a perspective view showing mechanical control components ofthe engine of FIG. 1;

FIG. 1B is a diagrammatic view of a load regulator of the engine of FIG.1;

FIG. 2 is a diagrammatic view of the two-cycle diesel engine of FIG. 1after it has been retrofitted with an electronic fuel injection systemaccording to the present invention;

FIG. 3 is a fragmented, perspective view of an electronic control moduleof the retrofitted engine of FIG. 2;

FIG. 4 is a front elevation view of a mounting plate for the electroniccontrol module of FIG. 3;

FIG. 5 is a side elevational view of the mounting plate of FIG. 4;

FIG. 6 is a diagrammatic view of electrical connections of theretrofitted engine of FIG. 2;

FIG. 7A is a graphical representation of injection events for acombustion cycle of the retrofitted engine of FIG. 2;

FIG. 7B is a graphical representation of alternative injection eventsfor a combustion cycle of the retrofitted engine of FIG. 2;

FIG. 8 is a fragmented, perspective view of an electronic governor boxof the retrofitted engine of FIG. 2;

FIG. 9 is a side elevational view of a mounting bracket for theelectronic governor box of FIG. 8;

FIG. 10 is a front elevational view of the mounting bracket of FIG. 9;

FIG. 11 is a perspective view of timing gear unit of the retrofittedengine of FIG. 2;

FIG. 12 is an exploded perspective view of the timing gear unit of FIG.11 with some components in dashed lines and some components removed forclarity;

FIG. 12A is another exploded view of the timing gear unit of FIGS. 11and 12 with some components removed for clarity;

FIG. 12B is a side view of the timing gear unit of FIGS. 11 to 12A withsome components removed for clarity;

FIG. 12C is a top view of the timing gear unit of FIGS. 11 to 12B withsome components removed for clarity;

FIG. 12D is a top view similar FIG. 12C but showing an alternativeconfiguration of the timing gear unit;

FIG. 12E is a top view similar FIGS. 12C and 12D but showing an anotheralternative configuration of the timing gear unit;

FIG. 13 is a top plan view of a mounting bracket for a junction box ofthe retrofitted engine of FIG. 2;

FIG. 14 is a front elevational view of the mounting bracket of FIG. 13;

FIG. 15 is a side elevational view of the mounting bracket of FIGS. 13and 14;

FIG. 16 is a perspective view of an adapter block connection of theretrofitted engine of FIG. 2;

FIG. 17 is another perspective view of the adapter block connection ofFIG. 16;

FIG. 18 is a perspective view of a direct fuel manifold connection ofthe retrofitted engine of FIG. 2; and

FIG. 19 is another perspective view of the connection of FIG. 18.

It should be understood that the appended drawings are not necessarilyto scale, presenting a somewhat simplified representation of variouspreferred features illustrative of the basic principles of theinvention. The specific design features of retrofitted two-cycle dieselengines as disclosed herein, including, for example, specificdimensions, orientations, locations, and shapes of the variouscomponents, will be determined in part by the particular intendedapplication and use environment. Certain features of the illustratedembodiments have been enlarged or distorted relative to others tofacilitate visualization and clear understanding. In particular, thinfeatures may be thickened, for example, for clarity or illustration. Allreferences to direction and position, unless otherwise indicated, referto the orientation of the adjustable control pedal assembliesillustrated in the drawings. In general, up or upward refers to anupward direction within the plane of the paper in FIG. 1 and down ordownward refers to a downward direction within the plane of the paper inFIG. 1.

DETAILED DESCRIPTION OF CERTAIN PREFERRED EMBODIMENTS

It will be apparent to those skilled in the art, that is, to those whohave knowledge or experience in this area of technology, that many usesand design variations are possible for the improved systems and methodsdisclosed herein. The following detailed discussion of variousalternative and preferred embodiments will illustrate the generalprinciples of the invention with reference to an EMD 16-645E Roots-blownengine. Other embodiments suitable for other applications will beapparent to those skilled in the art given the benefit of thisdisclosure.

Referring now to the drawings, FIG. 1 shows an existing or in-usetwo-cycle mechanically-injected diesel engine 10 having and anassociated equipment rack 12 which supports a collection of componentsthat serve the engine 10. The illustrated engine 10 is an EMD 16-645ERoots-blown engine but it is noted that any other EMD 547/645 two-cyclemechanically-injected diesel engine can be retrofitted according to thepresent invention. The term “retrofit” is used in this specification andthe claims to mean the modification of an engine in its pace of usewithout removal as required for an overhaul or rebuild.

The illustrated engine 10 has an engine block 14 with sixteencylinders—two rows of four cylinders 16 on each side. The illustratedengine 10 includes mechanical fuel injectors 18 for injecting fuel intothe cylinders 16, a mechanical governor 20 for controlling the fuel flowfrom the mechanical fuel injectors 20, a rack and associated linkage 22connecting the governor 20 to the mechanical fuel injectors 18, an overspeed trip linkage and lay shaft assembly 24 for controlling the rack 22of the fuel injectors 18, and a mechanical load regulator assembly 26for setting a governor excitation voltage.

The illustrated equipment rack 12 includes a support structure 28, alubrication oil cooler 30 supported by the structure 28, a lubricationoil filter 32 supported by the structure 28, a fuel pump 34 supported bythe structure 28, and an engine coolant expansion tank 36 supported bythe structure 28. Lubrication oil flows from an oil pan of the engine 10through a strainer on the engine block 14 to the filter 32 on theequipment rack 12. From the filter 32, the oil flows to the oil cooler30 and then to a pressure side of the strainer housing on the engine 10where it is forced back into the engine 10 by a pressure pump. The fuelpump 34 on the equipment rack 12 selectively pumps fuel from a fuelsupply tank to a manifold assembly 38 on the engine 10 which distributesthe fuel to the mechanical fuel injectors 18. A fuel filter ispreferably provided at the fuel pump 34. A fuel supply line 40 connectsthe fuel pump 34 to the manifold assembly 38. A fuel return line 42connects the manifold assembly 38 to the fuel supply tank to returnresidual fuel in the manifold 38. The engine coolant expansion tank 36is part of an engine cooling system which includes coolant manifolds onthe engine 10 for cooling the engine cylinders 16 during operation.Coolant is pumped from the expansion tank 36 to the manifold and back byengine 10 mounted water pumps. The expansion tank 36 typically includesa sight glass, a filler and pressure cap, and a low coolant levelswitch.

FIG. 2 shows the two-cycle mechanically-injected diesel engine 10 ofFIG. 1 retrofitted to a two-cycle electronically-injected diesel engineaccording to the system and method of the present invention. Theretrofit method includes the steps of removing the mechanical governor20, the rack and associated linkage 22, the mechanical fuel injectors18, the over speed trip linkage and lay shaft assembly 24, and themechanical load regulator 26 from the engine (best shown in FIGS. 1, 1A,and 1B). A governor angle drive housing 44 is also removed from theengine 10.

As best shown in FIG. 3, a controller or electronic control module 46 issecured to the equipment rack 12. The illustrated controller 46 isinstalled on the left side (the coolant tank sight glass side) of theequipment rack 12. To secure the illustrated controller 46 to theequipment rack 12, a mounting plate 48 substantially the same size asthe controller 46 is welded to the support structure 28. The controller46 is then attached to the mounting plate 48. The illustrated mountingplate 48 is a planar rectangular plate with four threaded studs 50 (bestshown in FIGS. 4 and 5). The mounting plate 48 can be, for example, a0.25 inch thick steel plate. The threaded studs 50 extend throughmounting lugs of the controller 46 and cooperate with threaded nuts 52for removably attaching the controller 46 to the mounting plate 48 fixedto the equipment rack 12. It is noted that any other suitable attachmentmeans can alternatively be utilized. The illustrated controller 46 hasuser interface controls 54 located so that they are clearly visible fromthe walkway between the engine 10 and the equipment rack 12. Theillustrated controller 46 is provided with electric connectors 56 facingin a downward direction for ease of installing and removing electricalconnections.

The controller 46 is provided with processing means and memory means.The controller 46 is electrically connected to electronic unit fuelinjectors 58 and delivers an electronic injection signal to theelectronic unit fuel injectors 58 (best shown in FIG. 6). The controller46 is provided with software which programs the controller 46 to improvethe emissions performance of the engine 10. The electronic controlmodule 46 is preferably programmed to provide multiple injection events59 (combinations of pre-injection 59A, main injection 59B, postinjection 59C) during a single combustion period to improve emissionsperformance. FIG. 7A illustrates a post injection %9C after a maininjection 59B. The post-injection 59C causes a small amount of fuel tobe injected into the cylinder 16 after the main injection 59B tooptimize combustion through extended combustion cycles and resultingemissions reduction. FIG. 7B illustrates a pre-injection 59A prior tothe main injection 59B. The pre-injection 59A causes a small amount offuel to be injected into the cylinder 16 early in the combustion cycleto optimize combustion through peak firing pressure and emissionsreduction. The injection events 59 during a single combustion period canbe evaluated and applied at each engine operating point to achieveoptimum emissions performance. Thus, the various engine operating pointswill utilize different injection events 59 including one or twopre-injections 59A with a main injection 59B and no post injections 59C,a main injection 59B with no pre-injections 59A or post injections 59C,a main injection 59B with one or two post injections 59C and nopre-injections 59A, or a main injection 59B with one or twopre-injections 59A and one or two post injections 59C. Variouscombinations of injection events 59 throughout the operating range ofthe engine 10 are determined to achieve the most effective emissionsreduction while maintaining efficient engine operation for the specificengine 10 and the controller 46 is programmed accordingly.

Programming of the electronic control module 46 is customized for eachengine operating point to achieve an improved emissions performance fora given duty-cycle. Locomotives have either switch duty-cycle foroperating in local yards arranging cars for their primary purpose orline haul duty-cycle for operating across the country for long distancedeliveries. Marine typically has power rating duty-cycles consisting offour operating points of varying speed and horsepower. Generators havefewer operating points. The EPA weights these operating points dependingon the frequency of operation at a given point. Switch locomotives willspend the majority of their time in idle or lower notches compares toline haul locomotives which will spend the majority of their time in themaximum horsepower notches. The software is customized for theapplication by optimizing different run-points so that the weightedresults achieve the desired emissions.

As best shown in FIG. 8, an electronic governor box or module 60 issecured to the equipment rack 12. The illustrated electronic governorbox 60 is installed directly to the coolant tank 36 on the equipmentrack 12. To secure the governor box 60 to the coolant tank 36, amounting bracket 62 having a radius substantially the same size as thecoolant tank 36 is welded to the coolant tank 36. The governor box 60 isthen removably attached to the mounting bracket 62. The illustratedmounting bracket 62 has two side panels 64 each with a radiussubstantially the same size as the coolant tank 36 and upper and lowerbraces 66, 68 extending between the side panels 64 (best shown in FIGS.9 and 10). The side panels 64 and braces 66, 68 can be, for example,formed from 0.25 inch thick steel plates and welded together. The braces66, 68 are provided with four threaded studs 70 which extend throughmounting lugs of the governor box 60 and cooperate with threaded nuts 72for removably attaching the governor box 60 to the mounting bracket 62which is fixed to the coolant tank 36 and the equipment rack 12. It isnoted that any other suitable attachment means can alternatively beutilized. The illustrated governor box 60 is mounted so that it facesthe walkway between the engine 10 and the equipment rack 12. Theillustrated governor box 60 is provided with electrical connectors 74facing in a downward direction for ease of installing and removingelectrical connections.

As best shown in FIG. 6, the electronic governor box 60 is electricallyconnected to the existing locomotive electronics 76 in order toreplicate only the mechanical load regulator 26. The electronic controlmodule 46 is electrically connected to the governor 78 through theelectronic governor box 60 and determines excitation of the governor 78.As the governor 78 is excited, it creates resistance to determinehorsepower. Fuel is supplied to maintain the given RPM based on thehorsepower. Horsepower is determined by varying the excitation voltageand maintaining the RPM for a given excitation. For example, at idlethere would be no excitation voltage since the only power is thatrequired to keep the engine at speed. At full horsepower the excitationvoltage would be at maximum to create the largest resistance on theengine.

An angle drive replacement timing gear unit or speed and/or positionsensing device 80 is installed where the governor angle drive housing 44was previously attached. The illustrated replacement timing gear unit 80includes a timing gear 82 and at least one speed sensor 84 mountedinternal to the unit 80 (best shown in FIGS. 11 to 12C). The illustratedtiming gear unit 80 is attached with bolts but any other suitableattachment means can alternatively be utilized. The sensors 84 areconnected to the controller 46 to determine angular position androtational speed. The electronic control module 46 is programmed toutilize a signal from the speed sensors 84 of the timing gear unit 80for an indicator of engine angular position to be used for timing thefuel injection. Alternatively, the electronic control module 46 can beprogrammed to utilize an engine flywheel for an indicator of engineangular position for fuel injection timing.

The illustrated timing gear unit 80 includes a spline shaft/timing gearsubassembly 200, a sensor housing subassembly 202, and an adaptor plate204. The spline shaft/timing gear subassembly 200 includes a splineshaft 206 which sized for insertion into the angle drive location of theengine so that the spline shaft 205 rotates with the engine and thetiming gear 82 which is secured to the spline shaft 206 to rotate withthe spline shaft 206 and is sized to rotate with the engine in a 1:1ratio. The sensor housing subassembly 202 includes a sensor housing 208and the at least one electronic sensor 84 which is located adjacent tothe timing gear 82 to sense rotation of the timing gear 82 and isconnectable to the electronic control module 46 to provide electronicsignals to the electronic control module 46 for determining when toinject fuel with the electronic fuel injectors 58.

The illustrated spline shaft 206 has a vertically extending central axisof rotation 210. The lower end of the shaft 206 is provided with aspline 212 sized to cooperate with the female spline of the engine whichpreviously received a spline of the angle drive 44 which is no longerneeded due to the lack of a mechanical fuel injection system. The upperend of the shaft 206 is adapted to be secured to the timing gear 82 formutual rotation about the vertical central axis 210.

The illustrated timing gear 82 is has a vertical central axis and issecured to the upper end of the spline shaft 206 so that its centralaxis of rotation is coaxial with the central axis of rotation 210 of thespline shaft 206. The timing gear 82 has a plurality of outwardlydisposed and spaced apart teeth 214 about its periphery. The timing gear82 is sized so that it rotates with a 1:1 ratio with the enginecrankshaft. That is, the timing gear 82 rotates exactly one revolutionfor each revolution of the engine crankshaft. The illustrated teeth 214are equally sized and spaced to have seventy six of the teeth 214.However, one of the teeth 214 is not provided so that the timing gearhas seventy five of the teeth and a large gap 216 at one location equalto the sum of two of the other gaps 218 and the width of one of theteeth 214. The large gap 216 can be utilized to indicate absoluteposition of the engine. However, the large gap 216 can be eliminated ifthe absolute position of the engine is determined in another manner suchas, for example, either (1) proving a remote electronic sensor 84A atanother rotating component of the engine such as at the engine flywheel(best shown in FIG. 12D) or (2) providing at least two of the electronicsensors 84 adjacent the timing gear 82 with one of the two electronicsensors 84 measuring multiple signals per revolution of the timing gear82 to establish speed and the other of the two electronic sensors 84measuring one signal per revolution of the timing gear 82 to establishabsolute position (best shown in FIG. 12E). It is noted that any othersuitable number of teeth 214 can alternatively be utilized. It is alsonoted that a large number of the teeth 214 is desirable for detection atlow RPM, however, the total number of teeth 214 is limited by thediameter of the timing gear 82 and the tooth and gap widths needed forthe sensor 84.

The illustrated sensor housing 208 forms an interior cavity 220 forhousing the timing gear 82 and the sensors 84. The illustrated sensorhousing 208 has an open top which is selectably closed by a cover 222.The illustrated cover 222 is secured to the sensor housing 208 using aplurality of mechanical fasteners 224 but it is noted that any othersuitable means for releasably securing the cover 222 to the sensorhousing 208 can alternatively be utilized. The sensor housing 208 issized and shaped to rotatably support the vertically extending splineshaft 206 with the upper end of the shaft 206 supporting the timing gear82 within the cavity 220 and the lower end of the shaft 206 locating thespline 212 outside the sensor housing 208.

The lower end of the sensor housing 208 is provided with a hub 226 forcooperation with the adapter plate 204. The illustrated adapter plate204 has a central opening 228 sized for receiving the housing hub 226such that the adapter plate 204 is rotatable relative to the sensorhousing 208 about the housing hub 226. The adapter plate 204 has a firstplurality of openings 230. The openings 230 are positioned to align withthreaded mounting holes in the engine crankcase from which the angledrive 44 was removed. The illustrated first plurality of openings 230 issix openings but this may vary depending on the engine to which thetiming gear unit is being installed. The adapter plate 204 also has asecond plurality of openings 232. The openings 232 are sized andpositioned to cooperate with a clamp plate 234 and a plurality clampplate locking fasteners 236. The clamp plate locking fasteners 236 arespaced about the housing hub 226 and extend from the housing cavity 220through openings in the housing 208 and the openings 232 in the adapterplate 204 to threaded openings 240 in the clamp plate 234. When thefasteners 236 are tightened, the adapter plate 204 is clamped betweenthe housing 208 and the clamp plate 234 to prevent relative movementtherebetween. When the fasteners 236 are loosened, the adapter plate 204can rotate about the housing hub 226 relative to the housing 208 and theclamp plate 234. It is noted that rotation of the adapter plate 204 islimited by the length of the openings 232 which are preferably in theform of slots. The illustrated slots 232 are sized to permit the adapterplate 204 to rotate about 30 degrees but it is noted that any othersuitable amount can alternatively be utilized. The illustrated housing208 utilizes four fasteners 236 but it is noted that any other suitablequantity can alternatively be utilized.

A releasable lock 242 is preferably provided which releasably locks thetiming gear 82 to the sensor housing 208 so that the position of thetiming gear 82 relative to the sensor 84 can be maintained duringinstallation. The illustrated lock 242 enables the shaft 206, and timinggear 82 secured thereto, to be locked to the sensor housing 208 duringinstallation of the timing gear unit 80 to the engine and then unlockedfor use once installed to the engine as described in more detailhereinafter. The lock 242 enables the timing gear unit 80 to beprecisely preset at the factory using electronic feedback positioningsensors and then locked in place at the factory. This minimizes errorsin field installations. The timing gear unit 80 is installed with freemotion between the sensor housing 208 and the adapter plate 204 so thatthe spline shaft 206 can be inserted into the engine and the adapterplate 204 can be aligned with the engine crankcase mounting holeswithout changing the factory preset relationship between the timing gear82 and the sensor 84. Then once installed, the sensor housing 208 andthe adapter plate 204 are secured together. The timing and position iscorrect as long as the engine is lined up to 0 degrees when the splineshaft 206 is inserted into the engine. The illustrated lock 242 is arigid pin that extends through an opening in the housing 208 and into anopening in the shaft 206. The pin is inserted into the openings toprevent relative rotation between the shaft 206 (with the timing gear 82secured thereto) and the sensor housing 208 (with the sensor 84 securedthereto) during installation and selectively withdrawn to permitrelative rotation between the shaft 206 and the sensor housing 208 onceinstalled. It is noted that the shaft lock 242 can alternatively haveany other suitable form such as, for example, a pawl engaging the timinggear teeth 214. It is also noted that the adaptor plate 204 need not berotatable relative to the sensor housing 208 if the lock 242 directlyengages the timing gear 82 and the timing gear 82 is releasably securedto the spline shaft 206 so that the spline shaft 206 is rotatablerelative to the timing gear 82 during installation and then secured tothe timing gear 82 after installation.

The electronic sensor 84 is located adjacent the timing gear 82 in orderto sense passage of the timing gear teeth 214 and gaps 216, 218 as thetiming gear 82 rotates. The electronic sensor 84 can be of any suitabletype such as, for example, a hall effect sensor. A suitable Hall effectsensor is believed to be produced by Heinzmann. The illustrated timinggear unit 80 includes two of the electronic sensors 84 for redundancy.One of the two electronic sensors is a primary sensor and the other oftwo electronic sensors is a secondary sensor to be used if there is afailure with the primary electronic sensor. It is noted that thesecondary electronic sensor 84 can be eliminated if redundancy is notdesired. The illustrated two electronic sensors 84 are located about 40degrees apart but any other suitable spacing can be alternativelyutilized.

The illustrated electronic sensors 84 are secured to a sensor mountingplate 244 which is secured to the housing 208 within the cavity 220 by aplurality of mechanical fasteners 246. The illustrated sensor mountingplate 244 is a flat plate having a boss at its forward end that islocated in a bore under the timing gear 82. This allows the mountingplate 244 to pivot about the central axis 210 of the timing gear 82 whenthe mechanical fasteners 246 are loosened. Precise adjustment isaccomplished by turning an eccentric cam 248 located at the rear of thecam plate 244 when the mechanical fasteners 246 are loosened. Theillustrated eccentric cam 248 can adjust the sensors 84 plus or minus 4degrees from their nominal timing position but any other suitable amountcan alternatively be utilized.

During installation of the timing gear unit 80 into the engine, thespline shaft 206 and the timing gear 82 are locked into position to thesensor housing 208 by the lock 242 in order to maintain alignmentbetween the sensors 84 in the housing subassembly 202 and the timinggear 82 that is preset at the factory. The adapter plate 204 is loose sothat it can rotate relative to the sensor housing 208. With the engineat 0 degrees, the timing gear unit 80 is oriented in an approximatelyvertical or upright position and is pushed downward into the crankcasewhere the female spline of the engine accepts the spline shaft 206 ofthe timing gear unit 80. The adaptor plate 204 is free to rotate inorder to align the adaptor plate mounting holes 230 to the correspondingholes in the crankcase. Fasteners are then inserted and tightened tosecure the adapter plate 204 to the crankcase. The housing cover 222 isremoved from the sensor housing 208 and the fasteners 236 that attachthe sensor housing 208 to the clamp plate 234 are tightened to clamp theadapter plate 204 therebetween. The lock 242 is then removed allowingfreedom of rotation between the spline/shaft assembly 200 and thesensors 84 in the sensor housing subassembly 202. The cover 222 isreplaced and wire couplings of the sensors 84 are connected to theelectronic control module 46. The timing gear unit 80 is then ready forservice.

The Illustrated timing gear unit 80 has the additional feature ofallowing for mechanical adjustment of the sensors 84 and timing ifrequired. The sensors 84 can be mechanically adjusted plus or minus 4degrees from their nominal timing position. The illustrated embodimentallows for simultaneous adjustment of both of the sensors 84. The twoillustrated sensors 84 are mounted on the sensor mounting plate 244designed to precisely pivot around the timing gear 82. In order tomanually adjust the sensors 84, you first remove the sensor housingcover 222 and then loosen the mechanical fasteners 246 securing thesensor mounting plate 244. Utilizing a timing light or other method forsensing position and timing, you rotate the eccentric cam 248 as neededto precisely reposition the sensor mounting plate 244 and the sensors 84secured thereto. When the adjustment is complete, the mechanicalfasteners 246 are tightened to lock the position of the sensor mountingplate 244 and the cover 222 is secured back onto the housing 208. Thisadjustment can be made when the engine is running.

A fuel injector wiring junction box 86 is installed utilizing a mountingbracket 88 secured to the replacement timing gear unit 80. Theillustrated mounting bracket 88 has a vertical main portion 90 and ahorizontal bottom portion 92 perpendicularly extending from the lowerend of the main portion 90 (best shown in FIGS. 13 to 15). The mainportion 90 is provided with openings 94 for attachment of the wiringjunction box 86 using bolts or other suitable fasteners. The bottomportion 92 is provided with openings 96 for attachment of the bottomportion 92 o the top of the timing gear unit 80 using bolts or othersuitable fasteners. The mounting bracket 88 can be, for example, formedfrom 0.25 inch thick steel. The wiring junction box 86 can be of anysuitable type for electrically connecting the wires 98 extending fromthe controller 46 with the wiring harness 100 extending from theelectronic unit fuel injectors 58.

The unit electronic unit fuel injectors 58 are installed to the engine10 in the locations where the mechanical fuel injectors 18 whereremoved. The electronic unit fuel injectors 58 are designed specificallyfor the type of engine 10 to which they are being installed. Theelectronic unit fuel injectors 58 preferably provide increased injectionpressure and improved fuel atomization to improve emissions performance.Higher injection pressure can be used for better fuel atomization forless particulate matter creation during the combustion cycle and allowsthe timing to be retarded while still maintaining fuel economy.

The timing of the electronic unit fuel injectors 58 is set by moving theflywheel to the highest spot on the injector camshaft (the plunger ofthe injector will be depressed the maximum amount at this location). Anadjuster screw on the rocker arm is then turned all the way down (fullydepressing the plunger). Once the adjuster screw is bottomed out, it isreversed about 1.5 turns. Note that the highest spot on the injectorcamshaft may not match the timing plate for the engine 10 because it wasoriginally designed for the mechanical fuel injectors 18. This is onepossible method for setting the timing and other possible methods may beutilized to accomplish this task.

The electronic unit fuel injectors 58 are connected to the existing fuelmanifold 38 which in turn is connected to the fuel pump 34 to supplyfuel to the electronic unit fuel injectors 58. A first option forconnecting the existing fuel manifold 38 is to attach an adapter blockassembly 102 to the fuel manifold 38 which converts the existingfittings of the fuel manifold to threaded fittings for the electronicunit fuel injectors 58 (best shown in FIGS. 16 and 17). The adapterblock assembly 102 is attached to the existing fuel manifold 38 usingexisting bolt and nut connections. Threaded connectors 104 of flexibleinlet and outlet fuel lines 106 of the electronic unit fuel injector 58are then secured to two threaded fittings 108 of the adapter blockassembly 102 so that they are in communication with the fuel supply andfuel return lines 40, 42. A separate adapter block assembly 102 issecured to the fuel manifold 38 for each of the electronic unit fuelinjectors 58. It is noted that the existing manifold assembly 38 is notmodified and used as is.

The second option for connecting the fuel manifold assembly 38 is toremove the existing fuel manifold header from the engine 10 and drilland tap holes in the manifold header that are sized for direct threadedconnection of the connectors 104 of the inlet and outlet fuel lines 106of the electronic unit fuel injectors 58 (best shown in FIGS. 18 and19). The fuel manifold header is then reattached, threaded connectors110 are directly threaded into the newly drilled and tapped holes, andthe connectors 104 of the inlet and outlet fuel lines 106 of theelectronic unit fuel injectors 58 are threaded onto the connectors 110.In this option, the existing manifold assembly 38 is modified to createa new threaded connection for the fuel lines 106 of the electronic unitfuel injectors 58.

A lubrication oil pressure sensor 112 is installed. The oil pressuresensor preferably has a range of about 0 to 200 PSI and an output signalof about 0 to 5 VDC, although other output signals and pressure rangesmay be utilized to achieve the result. Supply voltage for the oilpressure sensor is supplied by the governor box 60. The oil pressuresensor 112 is electrically connected to provide the output signal to theelectronic control module 46. The oil pressure sensor 112 is installednear the input for the existing analog gage so that electronic controlmodule 46 receives a signal substantially similar to the readout so theoperator sees on the analog gage.

A coolant temperature sensor 114 is installed. The coolant temperaturesensor 114 preferably has a range of about 0 to 220 F and an outputsignal of about 4 to 20 mA, although other output signals andtemperature ranges may be utilized to achieve the result. Supply voltagefor the coolant temperature sensor 114 is supplied by the governor box60. The coolant temperature sensor 114 is electrically connected toprovide the output signal to the electronic control module 46. Thecoolant temperature sensor 114 is preferably installed where it willhave a substantially matched reading as the existing fan controllersensor. The electronic control module 46 has the capability to operatethe fans, if needed, so an input signal similar to the input signal theexisting fan controller is desired. The electronic control module 46 canbe programmed to change operation of the engine operation based onengine temperature. It is noted that while the illustrated embodimentutilized coolant temperature to represent engine temperature, oiltemperature, engine block temperature, or some other form of measurementcan alternatively be utilized to determine engine temperature.Preferably, engine operation is changed when the engine 10 first startsin cold weather. The electronic control module 46 can alter the fuelinjection to protect the engine 10 until it reaches normal operatingtemperature where the normal injection will resume.

A boost pressure sensor 116 is optionally installed. The boost pressuresensor 116 preferably has a range of about 0 to 30 PSI and an outputsignal of about 4 to 20 mA, although other output signals and pressureranges may be utilized to achieve the result. Supply voltage for theboost pressure sensor 116 is supplied by the governor box 60. The boostpressure sensor 116 is electrically connected to provide the outputsignal to the electronic control module 46. The boost pressure sensor116 may be installed at the engine left side #1 end behind the waterpump at the engine oil pressure valve, although other methods areavailable to achieve the result.

A crankcase vacuum sensor 118 is optionally installed. The crankcasepressure sensor 118 preferably has a range of about 0 to 30 PSI absoluteand an output signal of about 4 to 20 mA, although other output signalsand pressure ranges may be utilized to achieve the result. Supplyvoltage for the crankcase pressure switch 118 is supplied by thegovernor box 60. The crankcase pressure switch 118 is electricallyconnected to provide the output signal to the electronic control module46. The crankcase pressure sensor 118 may be installed at the lowercrankcase or engine protection device. The electronic control module 46can be programmed to monitor the crankcase vacuum to protect the engine10 as required.

An ambient pressure sensor 120 is optionally installed. The ambientpressure sensor 120 preferably has a range of about 0 to 30 PSI absoluteand an output signal of about 4 to 20 mA, although other output signalsand pressure ranges may be utilized to achieve the result. Supplyvoltage for the ambient pressure sensor 120 is supplied by the governorbox 60. The ambient pressure sensor 120 is electrically connected toprovide the output signal to the electronic control module 46. Theambient pressure sensor 120 may be installed in the locomotive where itcan measure ambient pressure. The electronic control module 46 can beprogrammed to change operation of the engine 10 based on altitudes,which is related to ambient pressure, to enhance emissions performanceat varying altitudes. These changes may include horsepower alteration,injection operation, and engine operation modifications.

Finally, the fuel injector wiring harness 100 is installed between theelectronic unit fuel injectors 58 and the junction box 86. The junctionbox 86 in turn is electrically connected to the electronic controlmodule 46.

The retrofitted engine 10 preferably includes at least one powerassembly component that has reduced oil consumption to enhance emissionsperformance. The majority of particulate matter is from lube oil versusdiesel fuel. In order to achieve the low PM requirements it isbeneficial to reduce the oil consumption within the engine. One methodfor achieving this is to modify the piston ring configuration to bettercontrol the oil. Reducing the amount of oil that is able to bypass thepiston rings and eventually enter the exhaust has significant impact onPM reduction. Other options may include valve guide seal configurations,honing tolerances/patterns, etc.

A kit for reducing exhaust emissions from an existing EMD 567/645two-cycle diesel engine 10 by retrofitting the engine 10 from mechanicalfuel injection to electronic fuel injection can comprise a plurality ofelectronic unit fuel injectors 58 and an electronic control module 46 tobe electrically connected to the electronic unit fuel injectors 58 fordelivering electronic injection signals to the electronic unit fuelinjectors 58 and programmed for operating the electronic unit fuelinjectors 58 to improve emissions performance of the EMD 567/645 twocycle diesel engine 10.

From the foregoing disclosure and detailed description of certainpreferred embodiments, it is apparent that the illustrated system andmethod extends the useful life of EMD 567/645 two-cycle diesel engines10 without requiring an expensive overhaul or new replacement engine. Itis also apparent that this unique retrofit strategy is relatively lowcost, is relatively easy to apply, and provides enhanced emissionsperformance. It is believed that this system and method enables EMD567/645 two-cycle diesel engines 10 to meet at least US EPA locomotiveTier 2 standards.

From the foregoing disclosure and detailed description of certainpreferred embodiments, it is also apparent that various modifications,additions and other alternative embodiments are possible withoutdeparting from the true scope and spirit of the present invention. Theembodiments discussed were chosen and described to provide the bestillustration of the principles of the present invention and itspractical application to thereby enable one of ordinary skill in the artto utilize the invention in various embodiments and with variousmodifications as are suited to the particular use contemplated. All suchmodifications and variations are within the scope of the presentinvention as determined by the appended claims when interpreted inaccordance with the benefit to which they are fairly, legally, andequitably entitled.

1. A device for sensing the speed of an EMD 567/645/710 two-cycle dieselengine having a crankcase housing a crankshaft, electronic fuelinjectors, and an electronic control system for controlling theelectronic fuel injectors, the device comprising: a shaft sized forconnection to the crankshaft of the engine so that the shaft rotateswith the engine; a gear operably secured to the shaft to rotate with theshaft and sized to rotate with the engine in a 1:1 ratio; and at leastone electronic sensor located adjacent the gear to sense rotation of thegear and connectable to the electronic control system to provideelectronic signals to the electronic control system for determining whento inject fuel with the electronic fuel injectors.
 2. The device asclaimed in claim 1, wherein the gear has at least one tooth missing toform a large gap for synchronization and absolute position monitoringusing the electronic sensor.
 3. The device as in claimed in claim 1,further comprising a lock for releasably locking the gear relative tothe electronic sensor during installation.
 4. The device as claimed inclaim 1, further comprising an eccentric cam mechanism for adjusting fortiming position of the electronic sensor without removal of the devicefrom the engine.
 5. The device as claimed in claim 1, further comprisinga housing for the gear and the electronic sensor and sized and shaped tomount to a governor angle drive location of the engine.
 6. The device asclaimed in claim 1, wherein there are two of the electronic sensors, oneof the two electronic sensors being a primary sensor and the other oftwo sensors being a secondary sensor to be used if there is a failurewith the primary sensor.
 7. The device as claimed in claim 1, whereinthe gear has a plurality of teeth all being equally spaced and whereinthere are two of the electronic sensors, one of the two electronicsensors measures multiple signals per revolution of the gear toestablish speed and the other of the two electronic sensors measures onesignal per revolution of the gear to establish absolute position.
 8. Thedevice as claimed in claim 1, wherein the at least one electronic sensormeasures multiple signals per revolution of the gear to establish speedand further comprising at least one remote electronic sensor locatedremote from the gear and which measures another rotating location of theengine to establish absolute position.
 9. The device as claimed in claim1, further comprising an adapter plate for attachment to the enginecrankcase and rotatable relative to the gear and the electronic sensorduring installation so that the adapter plate can be aligned with theengine crankcase while maintaining positional relationship between thegear and the sensor during installation.
 10. A kit for reducing exhaustemissions from an existing EMD 567/645/710 two-cycle diesel enginehaving a crankcase housing a crankshaft by retrofitting the engine frommechanical fuel injection to electronic fuel injection, the kitcomprising: a plurality of electronic unit fuel injectors; an electroniccontrol module to be electrically connected to the electronic unit fuelinjectors for delivering injection signals to the electronic unit fuelinjectors; and a device for sensing speed of the engine including: ashaft sized for connection to the crankshaft of the engine so that theshaft rotates with the engine; a gear operably secured to the shaft torotate with the shaft and sized to rotate with the engine in a 1:1ratio; and at least one electronic sensor located adjacent the gear tosense rotation of the gear and connectable to the electronic controlmodule to provide electronic signals to the electronic control modulefor determining when to inject fuel with the electronic unit fuelinjectors.
 11. The kite as claimed in claim 10, wherein the gear has atleast one tooth missing to form a large gap for synchronization andabsolute position monitoring using the electronic sensor.
 12. The deviceas in claimed in claim 10, further comprising a lock for releasablylocking the gear relative to the electronic sensor during installation.13. The device as claimed in claim 10, further comprising an eccentriccam mechanism for adjusting for timing position of the electronic sensorwithout removal of the device from the engine.
 14. The device as claimedin claim 10, further comprising a housing for the gear and theelectronic sensor and sized and shaped to be mounted to a preexistingangle drive location of the engine.
 15. The device as claimed in claim10, wherein there are two of the electronic sensors, one of the twoelectronic sensors being a primary sensor and the other of two sensorsbeing a secondary sensor to be used if there is a failure with theprimary sensor.
 16. The device as claimed in claim 10, wherein the gearhas a plurality of teeth all being equally spaced and wherein there aretwo of the electronic sensors, one of the two electronic sensorsmeasures multiple signals per revolution of the gear to establish speedand the other of the two electronic sensors measures one signal perrevolution of the gear to establish absolute position.
 17. The device asclaimed in claim 10, wherein the at least one electronic sensor measuresmultiple signals per revolution of the gear to establish speed andwherein the device further includes at least one remote electronicsensor to be located remote from the gear and to measure anotherrotating location of the engine to establish absolute position.
 18. Thedevice as claimed in claim 10, wherein the device further includes anadapter plate for attachment to the engine which is rotatable relativeto the gear and the electronic sensor during installation so that theadapter plate can be aligned with the engine while maintainingpositional relationship between the gear and the sensor duringinstallation.
 19. A method for retrofitting an EMD 567/645/710 two-cyclediesel engine to reduce exhaust emissions, the method comprising thesteps of: (a) removing a governor angle drive housing from the engine;and (b) securing a device for sensing speed of the engine at a governorangle drive location of the engine, the device for sensing speed of theengine including a shaft sized for connection to a crankshaft of theengine at the governor angle drive location of the engine so that theshaft rotates with the engine, a gear operably secured to the shaft torotate with the shaft and sized to rotate with the engine in a 1:1ratio, and at least one electronic sensor located adjacent the gear tosense rotation of the gear.
 20. The method as in claimed in claim 19,further comprising the steps of locking the gear against movementrelative to the electronic sensor prior to securing the device on theengine, inserting shaft into the engine after the gear is locked andwhile the engine is at 0 degrees, and unlocking the gear to permitrelative movement to the electronic sensor after inserting the shaft andsecuring the device to the engine.